EP3539797B1 - Pneumatique - Google Patents
Pneumatique Download PDFInfo
- Publication number
- EP3539797B1 EP3539797B1 EP19161493.2A EP19161493A EP3539797B1 EP 3539797 B1 EP3539797 B1 EP 3539797B1 EP 19161493 A EP19161493 A EP 19161493A EP 3539797 B1 EP3539797 B1 EP 3539797B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tire
- rubberized cord
- cord strip
- circumferential direction
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/0007—Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/1807—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers comprising fabric reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C9/2204—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre obtained by circumferentially narrow strip winding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/24—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up of arcuate parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/26—Folded plies
- B60C9/263—Folded plies further characterised by an endless zigzag configuration in at least one belt ply, i.e. no cut edge being present
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
- B60C2009/0092—Twist structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
- B60C2009/2016—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers comprising cords at an angle of 10 to 30 degrees to the circumferential direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
- B60C2009/2025—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers with angle different or variable in the same layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2035—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel built-up by narrow strips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2041—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with an interrupted belt ply, e.g. using two or more portions of the same ply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
- B60C2009/2266—Density of the cords in width direction
- B60C2009/2271—Density of the cords in width direction with variable density
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/10—Tyres specially adapted for particular applications for motorcycles, scooters or the like
Definitions
- the present invention relates to a tire according to the preamble of claim 1.
- JP 2017-177842 A below describes a pneumatic tire including a tread reinforcing band.
- This band has a central part located in the center in the axial direction and having a spiral structure in which a rubberized cord strip is wound circumferentially of the tire.
- the tire of JP 2017-177842 A has room for improvement concerning stability during braking.
- the inventors of the present invention have examined the pneumatic tire of JP 2017-177842 A and found that, during braking, the amount of deformation of the tread crown portion, in particular, in axial edge regions of the tread crown portion becomes larger, which makes the behavior of the tire during braking unstable.
- EP 0 333 628 A2 shows a generic tire according to the preamble of claim 1, which comprises a toroidal carcass, and a tread reinforcing layer disposed radially outside the carcass in a tread portion, wherein the tread reinforcing layer comprises a cord-reinforced part in which a rubberized cord strip with at least one reinforcing cord covered with a topping rubber is wound, the cord-reinforced part comprises a spiral part in which the rubberized cord strip is wound spirally and circumferentially of the tire, the spiral part includes a first edge part and a second part continued from the first edge part, in the second part, the rubberized cord strip is wound spirally and circumferentially of the tire more than one turn, and in the first edge part, the rubberized cord strip extends in the tire circumferential direction at an angle with respect to the tire circumferential direction which angle is smaller than that in the second part, and overlaps the rubberized cord strip in the second part.
- the tread reinforcing layer comprises a cord-
- a reinforcing layer formed by spirally winding a rubberized cord strip at a constant helical pitch may have, at the winding start position or winding end position of the rubberized cord strip, a triangular portion without the rubberized cord strip (namely, not reinforced by the rubberized cord strip) which is formed between a tire circumferential direction line passing through the axially outermost position of the reinforcing layer and the adjacent edge of the rubberized cord strip. Therefore, an edge part of the reinforcing layer is reduced in the rigidity due to the un-reinforced triangular portion.
- the tread reinforcing layer according to the present invention is provided with the first edge part configured as described above, therefore, the formation of the above-described un-reinforced portion is prevented.
- the tread reinforcing layer according to the present invention is provided with the first edge part configured as described above, therefore, the formation of the above-described un-reinforced portion is prevented.
- it is possible to suppress the reduction in the rigidity of the spiral part in its edge part.
- the deformation of the edge part of the spiral part during braking can be suppressed. Therefore, according to the present invention, the behavior of the tire during braking is stabilized.
- the first edge part extends in the tire circumferential direction over a range in the tire circumferential direction which is not less than 45 degrees and not more than 360 degrees in terms of an angle around the tire rotational axis.
- the rubberized cord strip extends in a spiral manner such that the adjacent side edges thereof overlap each other.
- the tread reinforcing layer further includes a second edge part continued from the second part, and in the second edge part, the rubberized cord strip extends in the tire circumferential direction at an angle with respect to the tire circumferential direction which angle is smaller than that in the second part, and overlaps the rubberized cord strip in the second part.
- a distance equal to or less than the width of the rubberized cord strip is formed.
- the present invention can be applied to pneumatic tires and non-pneumatic tires in various categories such as for passenger cars, motorcycles, heavy duty vehicles, etc., Taking a pneumatic tire for a motorcycle as an example, embodiments of the present invention will be described in conjunction with accompanying drawings.
- Fig. 1 shows a pneumatic tire 1 for a motorcycle as an embodiment of the present invention.
- Fig. 1 there is shown a tire meridian section including the tire rotational axis (not shown) of the tire 1 in its normally inflated unloaded condition.
- the normally inflated unloaded condition is such that the tire is mounted on a standard wheel rim and inflate to a standard pressure but loaded with no tire load.
- the standard wheel rim is a wheel rim officially approved or recommended for the tire by standards organizations, i.e. JATMA (Japan and Asia), T&RA (North America), ETRTO (Europe), TRAA (Australia), STRO (Scandinavia), ALAPA (Latin America), ITTAC (India) and the like which are effective in the area where the tire is manufactured, sold or used.
- the standard pressure is the maximum air pressure for the tire specified by the same organization in the Air-pressure/Maximum-load Table or similar list.
- the standard wheel rim is the "standard rim” specified in JATMA, the "Measuring Rim” in ETRTO, the "Design Rim” in TRA or the like.
- the standard pressure is the "maximum air pressure" in JATMA, the "Inflation Pressure” in ETRTO, the maximum pressure given in the "Tire Load Limits at Various Cold Inflation Pressures” table in TRA or the like.
- the tire 1 in the present embodiment comprises a tread portion 2 having a tread surface 2a contacting with the ground, a pair of sidewall portions 3, a pair of bead portions 4, a carcass 6 extending between the bead portions 4 through the tread portion 2 and sidewall portions 3, and a tread reinforcing layer 7 disposed radial outside the carcass 6 in the tread portion 2.
- the tread portion 2 is curved in an arc shape protruding outwardly in the tire radial direction so that the maximum cross section width of the tire occurs between the tread edges TE and TE.
- the tread portion 2 comprises a crown region 2C including the tire equator C, and a pair of shoulder regions 2S on both sides thereof.
- the shoulder regions 2S respectively range from the edges in the tire axial direction of the crown region 2C to the tread edges TE.
- the carcass 6 is composed of at least one carcass ply 6A.
- the carcass ply 6A is formed from carcass cords rubberized with topping rubber and arranged at an angle of from 75 to 90 degrees with respect to the tire equator C.
- the carcass ply 6A comprises, for example, a main portion 6a extending between the bead portions 4 through the tread portion 2 and the sidewall portions 3, and a pair of turned up portions 6b continued from the main portion 6a and turned up around bead cores 5 disposed in the respective bead portions 4.
- the tread reinforcing layer 7 curves along the tread portion 2 and extends over substantially the entire width of the tread portion 2. As a result, the tread reinforcing layer 7 increases the stiffness of the tread portion 2 over the entire tread portion 2. From such a viewpoint, it is desirable that the width Wt of the tread reinforcing layer 7 measured along the tread surface 2a is set in a range from 75% to 95% of the developed tread width TW measured between the tread edges TE along the tread surface 2a.
- the tread reinforcing layer 7 comprises a cord-reinforced part 8 formed by winding a rubberized cord strip 9 around the carcass 6.
- the rubberized cord strip 9 is a strip or tape of a topping rubber 11 in which at least one reinforcing cord 10 is embedded along the length thereof. In this example, a plurality of parallel reinforcing cords 10 are embedded as shown in Fig. 2 .
- steel cords and organic fiber cords can be used.
- the rubberized cord strip 9 in this example has a substantially rectangular cross-sectional shape, and has side edges 9s extending in the longitudinal direction.
- the width W1 of the rubberized cord strip 9 is, for example, set in a range from 2.5 to 12.0 mm.
- the thickness t1 of the rubberized cord strip 9 is, for example, set in a range from 0.6 to 3.0 mm.
- the reinforcing cords 10 are arranged side-by-side in the widthwise direction and extend in parallel with the side edges 9s.
- Fig. 3 shows a central part of the cord-reinforced part 8 developed in the tire circumferential direction by reducing the scale only in the tire circumferential direction. In Fig. 3 , therefore, the vertical length of the cord-reinforced part 8 corresponds to its entire circumferential length.
- the cord-reinforced part 8 includes a spiral part 13 in which the rubberized cord strip 9 extends spirally in the tire circumferential direction.
- Such spiral part 13 can exert a large hooping force to suppress the deformation of the tread portion 2 inclusive of the carcass 6 therein.
- the spiral part 13 includes a first edge part 15 (right side in the figure), and a second part 16 continued therefrom.
- the first edge part 15 and the second part 16 are formed from the one rubberized cord strip 9. That is, the rubberized cord strip 9A in the first edge part 15 is continued to the rubberized cord strip 9B in the second part 16. Thereby, the above-described action is effectively exhibited.
- the rubberized cord strip 9B is wound spirally more than one turn in the tread portion 2.
- Such second part 16 increases the stiffness of the tread portion 2 and improves the stability during braking.
- the rubberized cord strip 9B in the second part 16 is inclined, for example, at an angle ⁇ 1 of not less than 1 degree and not more than 5 degrees with respect to the tire circumferential direction. Thereby, the above-described function is effectively exerted.
- the rubberized cord strip 9B in the second part 16 is wound spirally so that the axially adjacent side edges 9s thereof come in contact with each other.
- the adjacent side edges 9s of the rubberized cord strip 9B are overlapped each other (not shown). Such second part 16 can further increase the binding force in the tread portion 2.
- the rubberized cord strip 9A extends in the tire circumferential direction at an angle ⁇ 2 with respect to the tire circumferential direction which angle is smaller than the angle ⁇ 1 of the rubberized cord strip 9B in the second part 16, and overlaps the rubberized cord strip 9B in the second part 16.
- the angle ⁇ 2 of the rubberized cord strip 9A in the first edge part 15 is preferably 2 degrees or less, more preferably 0 degree.
- the first edge part 15 extends over a range in the tire circumferential direction which is not less than 45 degrees but not more than 360 degrees in terms of an angle around the tire rotational axis.
- Such first edge part 15 can effectively reduce the above-mentioned un-reinforced part, and the behavior of the tire during braking can be further stabilized.
- the un-reinforced parts may not be effectively reduced.
- the range is not less than 90 degrees, more preferably not less than 180 degrees.
- the first edge part 15 extends over 360 degrees around the tire rotational axis.
- the spiral part 13 includes a second edge part 17 (left side in the figure) continued from the second part 16.
- the rubberized cord strip 9 extends in the tire circumferential direction at an angle ⁇ 3 with respect to the tire circumferential direction which angle is smaller than the angle ⁇ 1 of the rubberized cord strip 9B in the second part 16, and overlaps the rubberized cord strip 9B in the second part 16.
- such second edge part 17 can reduce the un-reinforced portion and suppress the lowering of the stiffness of the spiral part 13 in the edge portion in the tire axial direction.
- the angle ⁇ 3 of the rubberized cord strip 9C in the second edge part 17 is preferably set to be not more than 2 degrees, more preferably 0 degree. In the present embodiment, the angle ⁇ 3 in the second edge part 17 is the same as the angle ⁇ 2 in the first edge part 15.
- the second edge part 17 extends over a range in the tire circumferential direction which range is not less than 45 degrees but not more than 360 degrees in terms of an angle around the tire rotational axis. Such second edge part 17 can effectively reduce the above-mentioned un-reinforced part.
- Such range is more preferably not less than 90 degrees, still more preferably not less than 180 degrees.
- the second edge part 17 extends over 360 degrees around the tire rotational axis.
- the second edge part 17 and the second part 16 are formed from the one continuous rubberized cord strip 9. That is, the rubberized cord strip 9C in the second edge part 17 is continued from the rubberized cord strip 9B in the second part 16.
- the spiral part 13 is formed in a rectangular shape as shown in the develop view ( Fig. 3 ) by the first edge part 15, the second part 16 and the second edge part 17.
- a first overlap portion 18A in which the first edge part 15 and the second part 16 overlap in the tire axial direction, and a second overlap portion in which the second edge part 17 and the second part 16 overlap in the tire axial direction 18B are formed so as to be point symmetric about a point at the center of the spiral part 13.
- the first overlap portion 18A and the second overlap portion 18B are each formed in a triangular shape as indicated in Fig. 3 with hatching.
- the cord-reinforced part 8 further comprises a pair of lateral parts 14 disposed on both sides in the tire axial direction of the spiral part 13.
- the rubberized cord strip 9 is inclined at an angle ⁇ 4 with respect to the tire circumferential direction which is larger than the angle ⁇ 1 of the rubberized cord strip 9B in the second part 16.
- the spiral part 13 is disposed in the crown region 2C including the tire equator C.
- the widthwise center in the tire axial direction of the spiral part 13 is located at the tire equator C.
- the lateral parts 14 are disposed in the respective shoulder regions 2S axially outside the crown region 2C.
- the maximum width Wa of the spiral part 13 measured along the tread surface 2a of the tread portion 2 is set in a range from 5% to 15% of the developed tread width TW.
- the spiral part 13 can not extend over a central part of the tread portion which part contacts with the ground during straight running and subjected to a large braking force, therefore, there is a possibility that the behavior of the tire 1 during braking becomes unstable.
- the spiral part 13 is also disposed in each lateral part of the tread portion which part contacts with the ground only during turning, therefore, the mass of the tire 1 becomes increased, and as a result, the behavior of the tire during breaking becomes unstable.
- the rubberized cord strip 9 is wound circumferentially of the tire three or more turns.
- a gap 20 of not more than the width W1 of the rubberized cord strip 9 is formed between each of the lateral parts 14 and the spiral part 13.
- gaps 20 can prevent a large lateral force acting on the lateral part 14 during cornering from acting on the spiral part 13.
- the gap 20 having such dimension helps to maintain the rigidity of the cord-reinforced part 8 at high levels. It is however, also possible to omit such gap 20 between the lateral part 14 and the spiral part 13 in order to increase the rigidity of the cord-reinforced part 8.
- the rubberized cord strip 9 comprises a plurality of first inclined segments 22 and a plurality of second inclined segments 23.
- the rubberized cord strip 9 is inclined toward one side (diagonally right up in the figure) with respect to the tire circumferential direction.
- the rubberized cord strip 9 is inclined to the opposite direction to the first inclined segments 22 (diagonally right down in the figure) with respect to the tire circumferential direction.
- the side edges 22s of the first inclined segments 22 are arranged without coming into contact with each other, and also the side edges 23s of the second inclined segments 23 are arranged without coming into contact with each other.
- the first inclined segments 22 intersect with the second inclined segments 23, leaving space parts 24, and form a mesh structure. Since the lateral part 14 formed in such a mesh structure has high torsional rigidity, it is possible to stabilize the behavior of the tire 1 during cornering.
- the space parts 24 surrounded by the adjacent first inclined segments 22 and the adjacent second inclined segments 23 are formed in rhombic shapes.
- the tension acting on a part of the lateral part 14 can be distributed over the whole of the lateral part 14. As a result, a reduction in the stiffness of the tread portion 2 can be suppressed .
- angles ⁇ 4 of the first and second inclined segments 22 and 23 are set in a range from 3 to 15 degrees, more preferably from 4 to 12 degrees with respect to the tire circumferential direction. This makes it possible to further stabilize the behavior of the tire 1 during cornering.
- first inclined segments 22 and the second inclined segments 23 are connected to circumferential segments 25 extending parallel with the tire circumferential direction.
- Such circumferential segments 25 reduce bending stress of the rubberized cord strip 9, as compared with the case where the first inclined segments 22 and the second inclined segments 23 are directly connected, and suppress a reduction in the stiffness of the lateral part 14.
- the circumferential segments 25 are disposed at the outer edge 14e and the inner edge 14i in the tire axial direction of each lateral part 14.
- the circumferential segments 25a arranged at the outer edges 14e form the outer edges 7e in the tire axial direction of the tread reinforcing layer 7.
- the circumferential segments 25a are disposed in a ground contacting region occurring when fully leaning the motorcycle. During cornering under such fully leaning condition, the circumferential segments 25a cause a small cornering power and increases the ground contact, therefore, the behavior of the tire 1 can be stabilized.
- the circumferential segments 25b disposed at the inner edges 14i can stabilize the behavior of the tire 1 at the time of braking made mostly during straight running.
- the angle ⁇ 5 of the circumferential segments 25 with respect to the tire circumferential direction is smaller than the above-mentioned angle ⁇ 4, and the angle ⁇ 5 is preferably not more than 5 degrees, more preferably not more than 3 degrees, most preferably 0 degree.
- the circumferentially-adjacent circumferential segments 25 at each edge 14e, 14i are spaced apart from each other in the tire circumferential direction.
- the circumferential segments 25 alternate with gap portions 26 where the rubberized cord strip 9 is not disposed.
- test tires had the specifications shown in Table 1, and their common specifications are as follows.
- test tires were mounted on front and rear wheels of a 1300 cc motorcycle.
- the motorcycle was run on a dry asphalt road in a test course, and the test rider evaluated the stability at the time of braking during straight running and also during cornering.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Claims (6)
- Pneu (1) comprenant :une carcasse toroïdale (6), etune couche de renforcement de bande de roulement (7) disposée radialement à l'extérieur de la carcasse (6) dans une partie de bande de roulement (2), dans lequel :la couche de renforcement de bande de roulement (7) comprend une partie renforcée en corde (8) dans laquelle une bande de corde caoutchoutée (9, 9A, 9B) avec au moins une corde de renforcement (10) recouverte avec un caoutchouc de gommage (11) est enroulée,la partie renforcée en corde (8) comprend une partie en spirale (13) dans laquelle la bande de corde caoutchoutée (9, 9A, 9B) est enroulée en spirale et de manière circonférentielle par rapport au pneu (1),la partie en spirale (13) comprend une première partie de bord (15) et une seconde partie (16) continue à partir de la première partie de bord (15),dans la seconde partie (16), la bande de corde caoutchoutée (9B) est enroulée en spirale et de manière circonférentielle par rapport au pneu (1) sur plus d'un tour, etdans la première partie de bord (15), la bande de corde caoutchoutée (9A) s'étend dans la direction circonférentielle du pneu à un angle (θ2) par rapport à la direction circonférentielle du pneu, lequel angle (θ2) est inférieur à celui (θ1) dans la seconde partie (16), et recouvre la bande de corde caoutchoutée (9B) dans la seconde partie (16),caractérisé en ce que :la partie renforcée en corde (8) comprend, sur un côté de la direction axiale du pneu de la partie en spirale (13), une partie latérale (14) dans laquelle la bande en corde caoutchoutée (9, 9A, 9B) est inclinée à un angle (θ4) par rapport à la direction circonférentielle du pneu qui est supérieur à l'angle (θ1) de la bande de corde caoutchoutée (9B) dans la seconde partie (16),dans chacune des parties latérales (14), la bande de corde caoutchoutée (9, 9A, 9B) comprend une pluralité de premiers segments inclinés (22) et une pluralité de seconds segments inclinés (23),les premiers segments inclinés (22) sont inclinés dans une première direction par rapport à la direction circonférentielle du pneu,les seconds segments inclinés (23) sont inclinés dans la direction opposée aux premiers segments inclinés (22) par rapport à la direction circonférentielle du pneu,les bords latéraux (22s) des premiers segments inclinés (22) sont agencés sans venir en contact entre eux,les bords latéraux (23s) des seconds segments inclinés (23) sont agencés sans venir en contact entre eux, etles premiers segments inclinés (22) coupent les seconds segments inclinés (23) laissant des parties d'espace (24) pour former une structure en maille.
- Pneu (1) selon la revendication 1, dans lequel :
la première partie de bord (15) s'étend dans la direction circonférentielle du pneu sur une plage dans la direction circonférentielle du pneu qui n'est pas inférieure à 45 degrés et non supérieure à 360 degrés en terme d'angle autour de l'axe de rotation du pneu. - Pneu (1) selon la revendication 1, dans lequel :
dans la seconde partie (16), la bande de corde caoutchoutée (9B) s'étend d'une manière en spirale de sorte que ses bords latéraux (9s) adjacents se chevauchent. - Pneu (1) selon la revendication 2, dans lequel :
dans la seconde partie (16), la bande de corde caoutchoutée (9B) s'étend d'une manière en spirale de sorte que ses bords latéraux (9s) adjacents se chevauchent. - Pneu (1) selon l'une quelconque des revendications 1 à 4, dans lequel :la couche de renforcement de bande de roulement (7) comprend en outre une seconde partie de bord (17) continue à partir de la seconde partie (16), etdans la seconde partie de bord (17), la bande de corde caoutchoutée (9B) s'étend dans la direction circonférentielle du pneu à un angle (θ3) par rapport à la direction circonférentielle du pneu, lequel angle (θ3) est inférieur à celui (θ1) dans la seconde partie (16), et recouvre la bande de corde caoutchoutée (9B) dans la seconde partie (16).
- Pneu (1) selon l'une quelconque des revendications 1 à 5, dans lequel :
entre la partie latérale (14) et la partie en spirale (13), une distance égale ou inférieure à la largeur de la bande de corde caoutchoutée (9, 9A, 9B) est formée.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018044395A JP6729617B2 (ja) | 2018-03-12 | 2018-03-12 | タイヤ |
Publications (2)
Publication Number | Publication Date |
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EP3539797A1 EP3539797A1 (fr) | 2019-09-18 |
EP3539797B1 true EP3539797B1 (fr) | 2020-12-02 |
Family
ID=65729153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19161493.2A Active EP3539797B1 (fr) | 2018-03-12 | 2019-03-08 | Pneumatique |
Country Status (4)
Country | Link |
---|---|
US (1) | US20190275836A1 (fr) |
EP (1) | EP3539797B1 (fr) |
JP (1) | JP6729617B2 (fr) |
CN (1) | CN110254138B (fr) |
Family Cites Families (29)
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US3550667A (en) * | 1967-12-27 | 1970-12-29 | Goodrich Co B F | Pneumatic tire |
BE754927A (fr) * | 1969-08-19 | 1971-02-17 | Uniroyal Englebert France | Pneus ceintures |
JPS62178201U (fr) * | 1986-05-02 | 1987-11-12 | ||
JPS6483407A (en) * | 1987-09-24 | 1989-03-29 | Yokohama Rubber Co Ltd | Pneumatic radial tire for heavy load |
US4869307A (en) * | 1988-03-17 | 1989-09-26 | The Goodyear Tire & Rubber Company | Pneumatic tire and method for making same |
US4989658A (en) * | 1989-06-09 | 1991-02-05 | The Goodyear Tire & Rubber Company | Belt overlay structure for pneumatic tires comprising a single ribbon wrapped about the belt structure |
JPH03176206A (ja) * | 1989-09-07 | 1991-07-31 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2954665B2 (ja) * | 1990-06-13 | 1999-09-27 | 株式会社ブリヂストン | 高速走行に適した空気入りラジアルタイヤ |
US5178703A (en) * | 1990-10-24 | 1993-01-12 | Sumitomo Rubber Industries, Ltd. | Breaker with wound band |
JP3053287B2 (ja) * | 1991-12-26 | 2000-06-19 | 住友ゴム工業株式会社 | 自動二輪車用ラジアルタイヤ |
DE4212296A1 (de) * | 1992-04-11 | 1993-10-14 | Uniroyal Englebert Gmbh | Fahrzeugluftreifen |
IT1260508B (it) * | 1992-06-02 | 1996-04-09 | Pirelli | Miglioramenti alle strutture di cintura nei pneumatici per ruote di veicoli |
JP2799322B2 (ja) * | 1993-06-07 | 1998-09-17 | 住友ゴム工業株式会社 | 自動二輪車用空気入りタイヤ |
JPH08142226A (ja) * | 1994-11-15 | 1996-06-04 | Sumitomo Rubber Ind Ltd | 空気入りタイヤの製造方法 |
JP3837238B2 (ja) * | 1998-07-17 | 2006-10-25 | 横浜ゴム株式会社 | 空気入りラジアルタイヤ |
JP2000280710A (ja) * | 1999-03-31 | 2000-10-10 | Toyo Tire & Rubber Co Ltd | 空気入りラジアルタイヤ |
US20050194076A1 (en) * | 2004-03-08 | 2005-09-08 | Piet Vermaat | Pneumatic tire having a crown reinforcement structure with a plurality of adjacent cord reinforced strips and a process to manufacture or retread such a tire |
JP4452135B2 (ja) * | 2004-06-30 | 2010-04-21 | 住友ゴム工業株式会社 | 自動二輪車用空気入りタイヤ |
JP2006298082A (ja) * | 2005-04-19 | 2006-11-02 | Bridgestone Corp | 二輪車用空気入りタイヤ |
JP2006298206A (ja) * | 2005-04-21 | 2006-11-02 | Bridgestone Corp | 空気入りタイヤ |
JP2009119968A (ja) * | 2007-11-13 | 2009-06-04 | Bridgestone Corp | 二輪車用空気入りタイヤ |
JP5081212B2 (ja) * | 2009-10-08 | 2012-11-28 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP2011136669A (ja) * | 2009-12-29 | 2011-07-14 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ及びその製造方法 |
JP2013099905A (ja) * | 2011-11-09 | 2013-05-23 | Bridgestone Corp | ベルト補強層素材の形成方法および、空気入りタイヤ |
US20140138006A1 (en) * | 2012-11-22 | 2014-05-22 | Toyo Tire & Rubber Co., Ltd. | Pneumatic tire and manufacturing method of the same |
JP5918742B2 (ja) * | 2013-12-03 | 2016-05-18 | 住友ゴム工業株式会社 | 自動二輪用空気入りタイヤの製造方法 |
JP6506612B2 (ja) * | 2015-05-11 | 2019-04-24 | 住友ゴム工業株式会社 | モーターサイクル用タイヤ及びモーターサイクル用タイヤの製造方法 |
JP6786839B2 (ja) * | 2016-03-28 | 2020-11-18 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP6778101B2 (ja) * | 2016-12-27 | 2020-10-28 | Toyo Tire株式会社 | 空気入りタイヤ及びその製造方法 |
-
2018
- 2018-03-12 JP JP2018044395A patent/JP6729617B2/ja active Active
-
2019
- 2019-02-28 CN CN201910148983.6A patent/CN110254138B/zh active Active
- 2019-03-08 EP EP19161493.2A patent/EP3539797B1/fr active Active
- 2019-03-11 US US16/298,566 patent/US20190275836A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
US20190275836A1 (en) | 2019-09-12 |
CN110254138B (zh) | 2023-08-18 |
EP3539797A1 (fr) | 2019-09-18 |
CN110254138A (zh) | 2019-09-20 |
JP2019156112A (ja) | 2019-09-19 |
JP6729617B2 (ja) | 2020-07-22 |
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